Predictor Importance Values for paper birch (Betula papyrifera)

Predictor Name Importance Score Rank
Annual precipitation (mm)13.4935
Mean May-September precipitation (mm)21.998
Mean annual temperature (°C)18.3121
Mean May-September temperature (°C)19.8515
Mean temperature of coldest month (°C)20.2214
Mean temperature of warmest month (°C)22.237
Annual aridity index11.8640
Minimum elevation19.1716
Maximum elevation11.0941
Average elevation12.9137
Median elevation13.0636
Range of elevation21.7210
Elevation coefficient ofvariation16.4227
Elevation standard deviation24.883
Annual daylength coefficient of variation21.2811
Total available water capacity (cm, to 150 cm)16.5126
Total available water supply (cm, to 150 cm)15.4328
Depth to water table (cm)28.321
Soil permeability rate (cm/hr)12.7438
Soil calcium carbonate (% by weight)19.0117
Soil cation-exchange capacity17.6622
Soil pH14.1831
Soil bulk density (g/cm3)20.9512
Organic matter content (% by weight)16.6624
Potential soil productivity25.12
Soil erodibility factor, rock fragment free23.765
Soil erosion by wind (tons/acre/year)18.6718
Percent soil passing sieve No. 10 (coarse)23.456
Percent soil passing sieve No. 200 (fine)21.939
Percent clay (< 0.002 mm size)18.3820
Percent sand (< 0.002 mm size)24.24
Percent silt (< 0.002 mm size)16.5525
Percent of texture clayey14.0433
Percent of texture loamy14.929
Percent of texture sandy20.5113
Percent of texture other14.132
Alfisol (%)12.139
Aridisol (%)1.0245
Entisol (%)8.0342
Histosol (%)17.4823
Inceptisol (%)18.5219
Mollisol (%)13.8234
Spodosol (%)14.4730
Ultisol (%)6.1343
Vertisol (%)2.6944